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In which of the following pair both species have compairable bond order. (1) O2[AsF6], BaO2[O-O bond order] (2) C2, CaC2[C-C bond order] (3) C2H2, CaC2[C-C bond order] (4) CaC2, N2–2[C-C and N-N bond order] |
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Answer» Bond order = 1/2×(N B −N AB )Order of filling MO is:1. N 2 :valence electrons=5+5=10(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 BO=1/2×(6−0)=3; 2. N 2− :valence electrons=5+5+1=11(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 1 BO=1/2×(6−1)=2.5;3.O 2 :valence electrons=6+6=12(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 2 BO=1/2×(6−2)=2;4. O 2− :valence electrons=6+6+1=13(σ2s) 2 (σ∗2s) 2 (σ2p) 2 (π2p) 4 (π ∗ 2p) 3 BO=1/2×(6−3)=1.5;Bond STRENGTH ∝bond orderbond strength/order: N 2 >N 2− and O 2 >O 2− Therefore, B is correct. |
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